Phys100 Assignment Cover Sheet
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Phys100 Written Assignment #4
Due
1. A river
is 1.2 km wide and its current is flowing at 3 km/h. A man wants to drive a
boat across the river to reach a point on the other bank directly opposite to
his starting point. His boat is
capable of travelling 5 km/h in still water.
A) At what angle upstream should the man
point his boat (q=?)?
B) How long does it take for him to cross
the river?
2. A ball is thrown from the roof of a building at a 60กใ angle above the horizontal with a speed of 16 m/s. 5.0 seconds later, the ball hits the ground. Ignore the air resistance.
A)
Determine height of the building.
B)
Find the
horizontal distance x.
3. A Pendulum is
a small bob swinging to and fro on a string, as shown in the figure below. The
bob reaches the bottom A with a horizontal velocity of 2.0m/s to the
right. 0.50s later, it reaches B
with a velocity 0.40m/s at an angle of 30กใ. The length of the string is 1.25m.
(a) Find the horizontal component of
the velocity of the bob at B.
(b) Find the average acceleration of
the bob over the time interval between A and B.
4. Textbook
page 100 question #18.
5. Textbook
page 101, questions #34.
6. Textbook
page 101, questions #36.
7. Textbook
page 103 question #60.
8. Textbook
page 104, questions #75, 76, 77, 78, 79.